Mold for fiber pulp



4 Oct. 25, 1932. F. s. FARLEY I 1,883,888

MOLD FOR FIBER PULP oct. 25, 1932. F s FAR'LEY l 1,883,888

MOLD FOR FIBER PULP Filed 1208.812, 1980 sheets-,asma 2 2g HG.

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ct. 25, 1932. F. s FARLEY 1,883,888y

MOLD Fon FIBER PULP Filed Dec. 12. 1930 4 Sheets-Sheet 3 FZG'LIQ glErFIG- ML WITNESSES INVENTOR 17/ Fzunczls S.Faec2/ ATI' Y OctT 25, g 1932.

F. s. FARLEY v MOLD FOR FIBER PULP Filed Dec.

12, 1930 4 Smets-Sheet 4 w-N asses wd d d F www ma f m F Patented oct.'2s, 1932` UNiTi-ofsTATEs FRANCIS S.

ranLnY, oF rnnNroN, NEW JERSEY, AssiGNoa 'ro DANIEL imNsoN 'sUTHEnLANnan., or moimrsvILLn, rENNsYLvANIA MOLD ron FIBER PULP Application ledDecember 12, 1930. Serial No.`501,765.

My invention relates to moldsfor fiber pulp and the like, and isespecially concerned with provisions for venting such molds yof airduring ingress of the prillp e invention permits more rapid operation,avoids trouble and inconveniencerminimizes loss due to damaged ordefective sheets, and improves the economy of production. Otheradvantages that can be realized through the invention will appear frommy description hereinafter of a selected and preferred form ofembodiment.

In the drawings, Fig. I is a fragmentary elevation of a wet machine forforming pulp sheets conveniently embodying my invention, with certainparts in vertical section as indicated by the line and arrows I-I inFig. II.

Fig. II is a fragmentary elevation at rightv angles to Fig. I, withcertain parts in vertical section as indicated by the line and arrowsII-II in Fig. I.

Fig. III is a plan view of the top mold shown in Figs. I and II, withcertain associated parts and connections.

Fig. IV shows a vertical section through an air vent shown in Figs.I-III, taken as indicated by the line and arrows IV-IV in Fig. VI.

Fig. V shows a similar section at right angles to Fig. IV with the partsin different relative positions, taken as indicated by the line andarrows V-V in Fig. VI.

Fig. VI is a plan view of the lower por-A tion of the air vent casing,with certain associated parts in section as indicated by the line andarrows VI--VI in Fig. V.

Fig. VII is an inverted plan view of the upper portion of the air venteasing.

Fig. VIII shows a vertical mid-section through the ejector.

In practice, raw fiber sheets for the manufacture of fiber board and thelike are formed from aqueous pulp by draining or squeezing away thewater, leaving the fibers interlaced in a porous, moist, frail aggregatethat can afterward be consolidated or compacted into a board, usually byheat and pressure. One way of forming such a raw fiber sheet is by meansof a mold of the general type illus;

trated in Figs. I-III, having a shallow, flat cavity into which thelpulp is run from lioppers (not shown) through openings 10,

in the opposite edges or end deckles 11, f

11 of the mold, and whence the water is drainedaway when the opposite(to and bottom) 'mold walls 12, 13 are broug ttogether. For this latterpurpose, the mold bottom 13 is shown as having a multitude of linedrainage ducts 14, with a perforated or foraminous screen 15 over them.As here shown, the mold topA 12 is supported in fixed position bylongitudinal beams 16 which are in turn supported by beams 17 mounted oncolumns 18 alongside the mold. The mold bottom l13 and its supportingstructure 19 are shown movable up and down by suitable means, such ashydraulic ram plungers 20. The edge walls or deckles 11 and 21 at theends and sides of the mold may also be vertically movable, so that theycan be lifted out of the Way for removal of the formed fiber sheet. Fig.I shows operating rods- 22 for the side deckles 21, as well as guides 23which are mounted on -the columns 18.

As shown in Figs. I, II, and III, there are two vents 24, 24 for ventingthe mold cavity of air when the pulp is entering it, and two ejectors25, 25 for detaching the formed fiber sheet from the mold top. Thesedevices 24, 24 and 25, 25 are located in the middle third of the moldarea, the two devices 24, 24 diagonally opposite one another, and thetwo devices 25, 25 likewise diagonally opposite one another. From thevents 24, 24 air discharge pipes 26, 26 lead up to a horizontalconnection 27, whence a common pipe 28 eX- tends to a suitable point ofdischarge.

The horizontal pipe 27 also has a water discharge connection 29, for anywater or pulp that may rise so high in the air discharge system.

As shown in Figs. IV, V, VI, and VII, each air vent 24 is controlled bya.I valve plunger 30, so that it can be closed each time after the moldis charged with pulp and opened again after the pulp sheet formed from acharge has been removed or ejected. The valve plunger 30 is arranged toslide in the bore of a casing or cylinder 31 mounted Vinoroveranopeninginuit m'old'iop l12. When inits upper ositionshown inFig. V,

the valve lies ilus with the mold wall and closes the opening therein.Around its inner i Vwall32, in which the'valve 30 slides, the casing 31affords an'annular chamber 33 having an involute or scroll enlargementat its upper,

end into which opensy the corresponding air discharge conduit 26, andalsohaving at its 1,0 ylo'wer end an annular port l34'adapted tocommunicate with the interior of the valve 30 as hereinafter described.The valve 30 is hollow,'with closed ends, and its interior is dividedbya.V septum 35 into lower and upper when the valve is inv its upperclosed position shown in Fig. V, and both of which are open when thevalve is in its lowerposition shown in, Fig.A IV, so that air from'themold can then pass up throughports 38, chamber 36,A

ports 39 and34 and chamber 33 to discharge 1 e-valve casing v31 has awaterpassage 40 connected toa water supply pipe 41 at one end andterminatin in a port in the wall of l the valve bore at 1ts other end.There isl also a water port42 through the inner casing' wall 32, fromthe valve bore into` the small end of the involute of chamber'33. The

l upper valve chamber 37 has ports 43 and 44 through its wall, thatregister with the water Vports 42 and 40 when the valve is in its upperposition shown. in Fig. V. This allows the water fromthe pipe 41`to passthrough ports Y and 44, chamber 37 and orts 43 and 42 into the upper endof cham r`33,- where it encounters a curved baille 45` (Figs. I Vand V)that vdeflects it downwardl in a ,circular path, washing out thechamber'33. 'A valve j 46 in pipe 41 serves tocontrol the flow ofwater.V As shown in Fig. I, the.v valve 46 is urged by means-of apull-'rod48 kconnected to' a Abell-crank lever 49 pivoted atf'51- andengage the valve stem 52.

Y of the scroll chamber, the entire inner wall 32, however, belonging tothe upper half.

There is also a separate lower member 58,. 00

v `Asshown'in FigsQIV-VIL the valve cashalves56rand .57,- divided in themid region closin' the bottom ofthe lower casing half 57 an forminga-continuation lof the valve bore in the upper half 56, and having aflange that fits into thev top' mold opening. The upper end of the valve30 is closed by a plug 59 screwed thereinto, and to this plug the memberv65. Fluid for this shut vby a helical compression spring 47but canbeopened at will by the operatorvent-foperatingrod 60 attached. I Acleanout plug 61 isshown inline with thewater 'port 40. A dowel pin-62fixed in one of the casing 'halves 56 .57" facilitatesassembling themproperly. he casing 31 is secured to 'themold top 12 by screws 63extending u throu ht-h'e mold top ,andtakingintoth'rea ed ho es in anexternal flange on thelowe'r casing part 57. These screws 63 valsoextend (1005) through holes in -an .external flange on the Acas-in part56 'As shown 1n Fig. VIII, eachA ejector 25 va movable4 plun er 65adaptedl to lie flushv with the lower ace'of the top'mold, 12 and closethe openin therein while the mold is being charged anthe sheet.formed,'and to be thereafter projected downward to push the formedsheetvaway' from the mold top, and also has means for admitting orforcing fluid between the mold -to and' .the'formedisheet, toseparatethem an Abreak the vacuum that may otherwise exist between them wheninitially separated. In the. present instance, the fluid admitting-valvemeans iscombined with the ush'ery lung'er/or depressor,65con sisting o aholow ',valve`with closed ends, `arranged to slidein `the bore ofa'casing or cylinder 66 mounted in orover'an o ning in the mold top 12.The dplunger as an annular series of outwar sloping ports 67 'at itslower end, which open through its periphery and are closed when it isits upper? most position, but lare just fully exposed when it isslightly depressed as Vshown in Fig.' i

VIII, so as to blowair orother fluid into the space opened bythedownward push of the V urpose is admitted .or supplled to the interiorof the valve V65 through an annular series of upward slo ing ports 68Awhich open through the peri ery of the valve'and are shown in'Fig. VIIl just fully open -into an internal annular groove 69 infthe casing66,to which auid supply pi e 70 is connected.` 'As shown, the upper en .ofthe casing-,66 hasa bleedn vent 71, for the escapeof any fluid thatmayleak ICI) around the cylinder65. The upper end screwed thereinto, to.which the' ejector-opu l ci) the cylinder 65 is closed bya plug 72 lllher 74 very similar to vthe part 58 in functionA and conformation, andas secured by screws 75 just as the'cas'ing 31 .is secured. i ing orcylinder .31 is made 1n upper and lower The lower parts 58'and 74 of thecasings 31 terial, vbored with special care to seal fluid .and 66 may beof bronzeor other suitable 4ma-y tight 4'(b'ut jwithout binding)l around'the valves'30. and 65, respectively.v i

As shown in Figs. I and II,'the vent and ejector-operating lrods 60, 60and .73,- 73 extend up to actuating cams 76, 76 and 77, 77 fastjonhorizontal shafts 78, 78 and 7 9,'79

1,sss,sss

s 60 and 73 is yieldingly urged upward by helical compression springs 90acting between a disc or spider 91 fast on the ro and a fixed supportingstructure 92 spanned between adjacent beams 16. The springs 90 aremounted around rods 93 whose lower ends are secured to the structure 92and whose upper ends are attached to a disc or spider 94 through whichthe rod 60 or 73 can s11de freely. Upward movement of each rod 60 and 73is limited by a boss on its disc 91 engaging the disc 94; downwardmovement of the rod is limited by its disc 91 engaglng a boss on the,structure 92. The upper end of each rod 60 .and 73 is provided with acontact roller 95 for its cam 76 or 77, and is guided by a bracket 96attached to one of the beams 17. Helical tension springs 97 act to pullthe rods 80, 85 to the right (Fig. I), and to rotate the cams 76, 77clockwise as far as permitted by stops 98.

In practice, assuming the mold ready yfor a charge of pulp, as shown inFig. I, a cycle of operation may be as follows:

The rod 84 is pulled down as far as posslble, turning the cams 76counterclockwise one revolution and depressing the rod 60, therebyopening the valves 30 to vent the mold of air, but closing the waterportsv 43, 44,-all as shown in Fig. V. As the valve 30 opens itsV ports39, 38 from the chamber 33 into the mold, all pulp and Wash water fromthe preceding cycle of operations runs into the mold and drops to itsbottom 13,-Whose drainage ducts 14 are'at this time shut oii` fromdischarge. Pulp is admitted to the mold in the usual manner, the valves30 meanwhile remaining open. The pulp fills the mold from both ends,while the air is eX- hausted from between the incoming pulp streamsthrough the valve 30, as already described; and some of the pulp evenfollows the air up into the vent chamber 33.

The operating rod 84 is now released, and the cams 76 are thereuponreturned clockwise by the springs 97 back to the position shown in Fig.I, and the valves 30 are raised and closed by their springs 90, shuttingolf the vents 24, 24 from the mold as shown in Fig. V, but opening theWater ports 43, 44, so that water can enter and flush the chamber 33.This iiushing may occur automatically, if the supply control valve isleft open all the time, and continue as long as the valve 30 remainsclosed; or it may be only momentary, as determined b the opening of thewater control valve 46 y the operator. v

The valve 30 being closed, the ducts 14 are opened to drainage and themold walls 12, 13'

gether in a moist, coherent raw sheet S, as

shown in Fig. V. Thereupon the mold walls 12, 13 may be separated, andthe deckles 11, 21

raised out of the way, to permit removal of the formed fiber sheet'S.

For this purpose, the operating rod 89 is pulled down as far aspossible, turning the cams 77 counter-clockwise one revolution anddepressing the rod 73, thereby also depressing the ejector valve asshown in Flg. VIII and admitting the air between the sheet` S and thetop mold 12, which is thus detached from the .to mold and drops on themold bottom 13, w ence it is removed. As the sheet S drops, the rod 89is released, the cams 77 are returned clockwise by the springs 97 backto their position shown in Fig. I, and the valves 65 are raised andclosed by their springs 90.

VIt only remains, therefore, to return the walls 12, 13 and the deckles11, 21 to their positions of Fig. I, whereupon the apparatus is readyfor another cycle of operation.

Having thus described my invention, I claim. Y l

1. The combination with the mold of a hydraulic wet machine, of meansfor venting the mold cavity of air through the top of the mold While themold is being lilled with pulp, and means for subsequently pushing thepulp sheet thus formed away from the mold top and admitting air betweenthem.

2. The combination with a hydraulic wet machine mold and its top wall,of air vent means on the mold top for venting the mold cavity of airwhile it is being filled with pulp, ejector means on the mold top fordetaching the pulp sheet thus formed from the mold top, means foractuating the ejector means, and means for actuating the air vent means.

3. The combination with the mold of a hydraulic wet machine, of meansfor venting the mold cavity of air through the top plate of the moldwhile the mold is being lled with pulp.

4. The combination with the mold of a hydraulic wet machine, of a valveon the top of the mold for venting the mold cavity of air while it isbeing filled with pulp, and means for liushing the valve of pulpentering it after the air.

5. The combination with the mold of a` the top ofthe mold having airports and pas# sages 1n communication with an air vent and water portsvin communication with a water supply and valve means reciprocable insaid 5 casing having separated water and air spaces in `its upperandlower ends, and adapted when raisedsto cut off its air space from themold cavity and from the water supply while admitting water to the airpassages of the casing, and when lowered to connect its air space and4said air passages with the mold s cavit 7. 'he combination with themold of a" hydraulic-wet machine, of a valve casing on the top of themold with valve bore open into the mold cavity at its lower end, airvent orts and passages in saidv casing opening into said bore, watersupply ports openin into saidbore above said air vent ports an from-saidbore intosaid air ventpassages at an intermediatelevel, and valve meansin said bore for connecting the mold cavity with rsaid air vent` portswhen the water ports are closed and for interconnecting the' water portswhen the air vent ports are closed.

8. The combination ywith the mold of'asheet-forming hydraulic wetmachine, of an ejector'for pul sheetsformed therein com-y prising meansor pushing a sheet' away from the mold walland means for admitting fluidunder pressurebetween the sheet and the 'moldwalhv' v- .9. Thecombination. with .the mold of a i sheet-forminghydraulic wet machine,of an l vejector forpulpfsheets formed thereincom# prising a push devicein themidst ofthe mold top for depressing a sheet away from' it, andmeans for admitting iiuid under pressure into the s ace thus: opened`between the mold top 4 andt esheet. 1 I

10. The -combination with an apertured mold wallof a hydraulic wetmachine, of an ejector for :pulp sheets formed in the machine`comprlsing a closure for the opening in the mold wallprojectible-therefrom to push a sheet away aroundfthe opening, and meansfor -f'orcing fluid through the opening into the space between the sheetandthe mold top.

11. The .combination with-an aperturedy mold top of a hydraulicwet'machine, of an ejector for. pulp sheets--formed in the ma` chinevcomprising 'a cylinder extending upward from said opening; a'hollowplunger 1n said cylinder ada ted to -clos'e the opening when raised, but`depressible to push a'sheet away from the `mold top around the opening,and apertured for the discharge of fluid from its, interior downwardandfoutward into the space betweenthe depressed. sheet fand the 5 moldtop; 'and means -for su plying Huid under pressure to the interior o'saidplunger. In testimony i whereof, I have hereunto signed my name atTrenton, New Jersey, this `9th. day of December, 1930.

v FRANCIS S. FARIJEY. s

